annotate MoinMoin/wikixml/marshal.py @ 5298:d57b74bc4cbd

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author Reimar Bauer <rb.proj AT googlemail DOT com>
date Fri, 20 Nov 2009 09:49:05 +0100
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1 # -*- coding: iso-8859-1 -*-
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2 """
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3 MoinMoin - XML Serialization
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4
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5 @copyright: 2002 Juergen Hermann <jh@web.de>
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6 @license: GNU GPL, see COPYING for details.
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7 """
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8
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9 class Marshal:
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10 """ Serialize Python data structures to XML.
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11
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12 XML_DECL is the standard XML declaration.
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13
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14 The class attributes ROOT_CONTAINER (default "data") and
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15 ITEM_CONTAINER (default "item") can be overwritten by derived
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16 classes; if ROOT_CONTAINER is `None`, the usually generated
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17 container element is omitted, the same is true for ITEM_CONTAINER.
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19 PRIVATE_PREFIXES is a list of prefixes of tagnames that are
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20 treated as private, i.e. things that should not be serialized.
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21 Default is to omit all properties starting with an underscore.
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22
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23 TAG_MAP is a translation table for tag names, and is empty by
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24 default. It can also be used to suppress certain properties by
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25 mapping a tag name to `None`.
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26 """
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27
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28 # Convenience: Standard XML declaration
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29 XML_DECL = '<?xml version="1.0" encoding="utf-8"?>\n'
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30
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31 # Container Tags
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32 ROOT_CONTAINER = "data"
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33 ITEM_CONTAINER = "item"
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34
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35 # List of private prefixes
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36 PRIVATE_PREFIXES = ['_']
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37
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38 # Translation map
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39 TAG_MAP = {}
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40
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41
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42 def __toXML(self, element, data):
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43 """ Recursive helper method that transforms an object to XML.
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44
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45 Returns a list of strings, which constitute the XML document.
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46 """
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47 # map tag names
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48 if self.TAG_MAP:
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49 element = self.TAG_MAP.get(element, element)
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50
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51 if element:
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52 for prefix in self.PRIVATE_PREFIXES:
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53 if element.startswith(prefix):
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54 return ''
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55 content = ['<%s>' % element]
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56 else:
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57 content = []
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58
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59 # Handle the different data types
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60 add_content = content.extend
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61
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62 if data is None:
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63 content = "<none/>"
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64
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65 elif isinstance(data, str):
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66 content = (data.replace("&", "&amp;") # Must be done first!
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67 .replace("<", "&lt;")
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68 .replace(">", "&gt;"))
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69
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70 elif isinstance(data, dict):
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71 for key, value in data.items():
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72 add_content(self.__toXML(key, value))
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73
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74 elif isinstance(data, (list, tuple)):
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75 for item in data:
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76 add_content(self.__toXML(self.ITEM_CONTAINER, item))
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77
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78 elif hasattr(data, "toXML"):
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79 add_content([data.toXML()])
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80
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81 elif hasattr(data, "__dict__"):
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82 add_content(self.__toXML(self.ROOT_CONTAINER, data.__dict__))
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83
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84 else:
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85 content = (str(data).replace("&", "&amp;") # Must be done first!
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86 .replace("<", "&lt;")
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87 .replace(">", "&gt;"))
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88
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89 # Close container element
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90 if isinstance(content, str):
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91 # No Whitespace
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92 if element:
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93 content = ['<%s>%s</%s>' % (element, content, element)]
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94 else:
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95 content = [content]
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96 elif element:
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97 # Whitespace
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98 content.append('</%s>' % element)
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99
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100 return content
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101
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102
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103 def toXML(self):
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104 """ Transform an instance to an XML string.
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105 """
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106 return '\n'.join(self.__toXML(self.ROOT_CONTAINER, self.__dict__))
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107